Check out these popular things to do in Las Vegas in the Winter. Save on admission to many of these top attractions, fun holiday events. Holiday Weather - We provide temperature, day and night temperature, sunshine hours and rainfall averages for Las Vegas, USA in January. But those who want a quieter and slightly low-key Las Vegas holiday should consider visiting during January, one of the city's low seasons. I have been in January, it was pretty cold at night but the weather in the day was still pleasant, coming king kong videospiel the North I didn't need a jacket in the day really, just a sweater. Especially when the wind kicks up. Pools; Pool Parties; which hotel? With more open rooms in hotels, prices often drop significantly. I live in a cold weather state winter sucks here in MN so January is not my time of year for Vegas. IrishFan 52, forum posts. See all hotels in Las Vegas.